Preparation of electrospun Co3O4 nanofibers as electrode material for high performance asymmetric supercapacitors

Ethanol-assisted solvothermal synthesis of porous nanostructured cobalt oxides (CoO/Co3O4) for high-performance supercapacitors

“…According to the three-electrode data, the specific capacitance (SC) of the single electrode material was calculated from the CVs and discharge curves with the Eqs. (1) and (2), respectively [12].…”

“…The diameter of the semicircle corresponds to the charge-transfer resistance (R ct ) caused by Faradic reactions and EDLC (C dl ) at the electrode/electrolyte interface [40]. The Warburg resistance (Z W ), the slope of the 45°portion of the Nyquist plots, is a result of the frequency dependence of ion diffusion/transport in the electrolyte to the bulk of electrode and the CPE is the constant phase angle element relates to the Z W [12]. The data are fitted using equivalent circuit model as shown in the inset of Fig.…”

“…For example, Wang et al reported fabrication of Co 3 O 4 @MWCNT nanocable using a simple hydrothermal procedure and it presented excellent rate capability for SCs [11]. Kumar et al prepared Co 3 O 4 nanofibers by electrospinning technique with a specific capacitance of 407 Fg À1 at a scan rate of 5 mV s À1 [12]. Luo et al synthesized three-dimensional (3D) enoki mushroom-like Co 3 O 4 hierarchitectures by a reflux method and it exhibited a high specific capacitance of 787 Fg À1 at a current density of 1 Ag À1 [13].…”

Asymmetric supercapacitor based on VS2 nanosheets and activated carbon materials

“…Various transition metal oxides and conductive polymers [21][22][23][24][25] are mostly used as positive electrodes due to their fast and reversible electron exchange reactions at the electrode interface which contribute to the high power densities and high capacitance of asymmetric supercapacitors. [26][27][28][29][30][31][32][33][34] .…”

Facile synthesis of Co3O4 with different morphology and their application in supercapacitors

“…Therefore, the control over the morphology of nanomaterials with well-defined shape and uniform size remains an important goal of modern synthetic chemistry, especially nanomaterials direct growth on conductive substrate. In comparison to the conventional Co 3 O 4 /carbon/PTFE electrode [18][19][20][21] , one-dimensional (1D) Co 3 O 4 materials grow on current-collecting substrates could enhance the power density (or rate capability) and cycling stability since this structure not only have the ability to increase the contact area between the electrolyte and active material but also provide accessible channels that facilitate mass and charge transport [22][23][24] . In order to solve this issue, great efforts have been devoted to creating nanostructured materials with large surface area to enhance the kinetics of ion and electron transport and also shorten the diffusion path of ions and electrons 25 .…”